ML20215N492
| ML20215N492 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 10/31/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Harold Denton, Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-1.D.1, TASK-TM NUDOCS 8611060097 | |
| Download: ML20215N492 (7) | |
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8 DUKE PowEn GOMPANY P.O. HOx 33189 CHARLOTTE, N.C. 28242 l'AL B. TUCKER TELEPHONE vnus reassonnT (704) 373-4531 NttLEAR etoptTTION 1
October 31, 1986 l
Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Mr. B. J. Youngblood, Project ~ Director PWR Project Directorate No. 4 Re:
Catawba Nuclear Station, Unit 1 Docket No. 50-413
Dear Mr. Denton:
Section 3.4 of Duke Power Company's response to Supplement I to NUREG-0737 provided the results of the control room review for Catawba Unit 1.
This document described the human engineering deficiencies (HED's) that had been identifie'd during the review and proposed an implementation schedule for the necessary modifications.
It was noted in the report (at page 6) that the proposed HED solutions might need to be modified during the design or installation process. The purpose of this letter is to update the previously submitted descriptions of HED solutions.
A description of revisions to HED solutions is provided as Attachment 1.
These changes were identified during the modification process as being necessary to comply with the intent of Supplement I to NUREG-0737. Also none of the revisions are deemed to have safety significance.
As required by License Condition 11 of Facility Operating License NPF-35 and as committed in the Response to Supplement 1 to NUREG-0737, all HED solutions will be implemented prior to restart from the first refueling outage. This outage is in progress and is scheduled for completion in early November, 1986. At that time, all efforts related to TMI Item I.D.1 will be complete for Catawba Unit 1.
Very truly yours.
Hal B. Tucker ROS/13/slb 8611050097 861031 PDR ADOCK 03000413 P
Attachment PDR xc:
Dr. J. Nelson Grace, Regional Administration NRC Resident Inspector U. S. Nuclear Regulatory Commission Catawba Nuclear Station Region II Og 101 Marietta Street, NW, Suite 2900 go Atlanta, Georgia 30323 P
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ATTACHMENT 1 REVISIONS TO HED SOLUTIONS DOCUMENTED IN DUKE POWER COMPANY'S RESPONSE TO SUPPLEMENT 1 TO NUREG-0737 Details in system design, operation, or equipment requirements revealed during the design and instal.lation process, indicated that eight Catawba Nuclear Station HEDs required revisions to their respective solutions as documented in Duke Power Company's Response to Supplement I to NUREG-0737. Each of these revisions was reviewed by the appropriate
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line organization to ensure that the final solution was.in accordance with good human engineering practices.
The revicions to the HED Solutions documented in the Response to Supplement 1 are as follows:
C-1-83 The HED solution recommended the addition of a label containing NARROW RANGE (NR) STEAM GENERATOR LEVEL information to be installed next to the WIDE RANGE (WR) S/G LEVEL meters on the Auxiliary Shutdown Panel.
This information was intended to be used by the operator as a convenient reference when transferring operation from Control Room NR instrumentation to the WR instrumentation on this panel.
In addition, the HED solution recommended a similar NR scale label be installed next to the WR S/G LEVEL meters in the Control Room for convenience.
NR and WR S/G LEVEL meters are provided in the Control Room.
During implementation of the.HED, it was determined that_the WR meters are calibrated at a different temperature than the NR meters..This difference in calibration compl) cates the use of the scale information.
The scale labels have been added to the Auxiliary Shutdown Panel and are configured to compensate for the calibration difference so that, along with procedures, operators can use these scales as a point of reference.
Since both NR and WR meters are provided in the Control Room where direct comparison of pointer position can be made and since the use of the reference label is somewhat complicated, it was determined that the label would not provide additional information useful in the Control Room.
Therefore, it was decided not to include the label in the Control Room.
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j C-1-104 The -HED solution recommended the addition of a Steam Bypass i
Controller to the Auxiliary Shutdown Panel (ASP).
This 1
controller is provided in the Control Room and allows the operator to bypass steam from the Steam Generators to the Condensor during start-up and shutdown, conserving fluid l
levels on the secondary side of the Steam Generators by not releasing steam to the atmosphere.
The installation of an 4
additional controller on the ASP would allow the' operator to use his normal cooldown instrumentation in the i
event of a shutdown from the ASP.
There is no safety significance to the use of the Steam Bypass Controller.
Individual control s for each of the four Steam Generator l
Power Operated Reliet Valves (PORVs) are provided both in the Control Room and on the Auxiliary Feedwater Pump Turbine Control Panel (located near the ASPS) for manual control of Steam Generator Pressure.
In addition the PORVs can be used to cool down the reactor in an emergency.
1 During the detailed design of the HED solution, it was determined that, in order to maintain the existing level of equipment protection and prevent overpressure of the Condensor, interlocks provided for the Control Room Steam Bypass Controller would need to be duplicated for the i
additional controller to be-added to the ASP.
The duplication of these protection interlocks, howavor, made the
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implementation of this solution significantly more complex and costly than could have been determined during the Control Room Review; and, in addition, could possibly degrade the original protection scheme due to the complexity required.
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Since (1) operation from the ASP is a very infrequent ~ event, i
(2) the Steam Bypass Controller would provide no sa'fety significant function, (3) emergency cooldown means (Steam Generator PORVs) is provided, and
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the interlocks required significantly increase the complexity and cost of this solution, and may degrade the original equipment protection scheme, it was decided not to add the Steam Bypass Controller
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to the #SP.
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PAGE 3 C-1-124 The HED solution recommended that consistent labeling of recorder pen color (red, green, blue) versus the pen function (Main Steam Pressure, for example).tm provided.
In addition, since Westinghouse recorders have Rod, Green, and Blue pens (top to bottom) and L&N recorders have Green, Blue, and Red 4
pens (top to botton) the HED solution also recommended that pen color order be standardized between these two types of recorders.
Labels have been added to each recorder to identify the function of each pen color and each label's color order (top to bottom) matches the pen color order for its recorder.
4 Example:
Red
- MAIN STEAM PRESSURE Green - MAIN STEAM TEMPERATURE Blue
- THROTTLE PRESSURE The labels installed on each recorder provide a clear, easily J
readable, reference between pen color and function.
During implementation of the HED solution, however, it was
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determined that the pens on both Westinghouse and L&N recorders are not interchangeable due to physical differences in the pen mechanisms.
Therefore, pen color order between these two types of recorders cannot be standardized.
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I C-1-283E The HED solution recommended the addition of position 4
indicating lights to the controller for NV-403.
This HED solution has already been adequately addressed since j
an E30 control switch for this valve with position indicating lights is located above and to the right of thi s controll er.
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PAGE 4 C-1-344 The HED solution recommended the replacement of two Cutl er Hammer E30 pushbutton switches which had confusing pushbutton configurations (two latching pushbuttons engraved OPEN and CLOSE, with a common release bar engre ed OFF).
Two 2-position Cutler Hammer 10250T rotary se'
_or switches were originally proposed because the control c4rcuits for the valve groups operated by these switches (each switch operates a group of four valves) required switches with maintained contacts.
However, during the detailed design of the HED solution, it was determined that an engineering revision to the circuit for one valve group required the use of momentary switch contacts.
Therefore the HED solution was modified to replace one of the original E30s with another E30 having two momentary pushbuttons.
The other E30 was replaced by the 10250T selector switch proposed in the HED solution.
C-1-366 The HED solution recommended the installation of valve position status lights tor Turbine Stop and Control valves to be located near their associated meters.
The Turbine l
Stop Valve status indication was recommended because the l
meters for these valves, supplied on the vendor panel, were small and status lights would be more visible to the operator for quick verification that the Turbine Stop Valves have l
closed after a trip.
Also, the HED solution recommended the addition of status lights for the Turbine Control Valves, so l
that, during testing, as the operator strokes the Control Valves and observes the valve position meter movement to check for proper valve operation, the status lights for closed indication would be available as additional indication.
l The Stop Valve position status lights were added under DCA ECSP-058.
During implementation of the HED solution, investigation of the location for the Control Valve status lights revealed that the space for status light indication was limited.
Jince the Control Valve status indication was i
included as an additional indication for convenience during valve testing, status lights for these valves were not added.
There is no safety significance to this revision l
of the HED solution.
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PAGE 5 C-1-430 The HED solution recommended the moving of the RL (Low Pressure Service Water) DISCHARGE FLOW meter and the RL DISCHARGE HEADER TEMPERATURE recorder from IMC9 to IMC13 to group these devices with other RL devices.
This HED will not be done for the following reasons:
ai Device RN12 (RL DISCHARGE FLOW meter) requries vertical mounting because it must be pulled out daily by the Control Room Operators to adjust flow setpoints as required by the Catawba Technical Specifications.
The setpoint adjust.aents are on top of the meter after it is partia11 rseoved from its case which would make these adjustments difficult to reach if the meter was mounted on the sloped turret section of I P.C13 (1MC13 does not have a vertical section), thus creating a potential maintenance HED.
An RL DISCHARGE PRESSL'RE meter is located above the RL controls on IMC13 providing indication of RL pump operation and the RL Discharge Flow meter on IMC9 can be seen by the operator at IMC13.
b)
Device RN9 (the recorder for RL INLET AND DISCHARGE TEMPERATURES), which is used primarily for historical records and the determination of heat exchanger tube leaks, is not closely related to the RL devices on IMC13 i
and does not need to be grouped with these devices.
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Devices RN9 and RN12 are related and should be kept together on MC9.
d)
These devices have no safety significance.
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PAGE 6' C-1-526 The HED solution recommended the addition of indicating lights to provide status information on the devices operated by the unit vent EMF TRAIN A INTLK key switches and the UNIT VENT EMF TRAIN B INTLK key switches and to clarify I
device functions on the nameplates for these switches.
However, during the detailed design it became evident that the only function of these switches was to provide contacts which bypaused interlock contacts in the starting circuits for the Auxiliary Building Exhaust Fans.
- Thus, there is no device actuation associated with these switches such as a pump starting or a valve opening which requires a feedback status.
In this case the switch position is the feedback status of whether or not the Interlock Contacts have been bypassed.
In addition, contacts on the switches provide switch position status to the Operator Aid Computer.
Therefore this HED was modified l
to delete the requirement for status lights but re-engrave the namep1rtes for these switches to more clearly indicate their association with the Auxiliary Building Exhaust Fan Controls.
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